Primary site in right colon (HR, 2.325; 95% CI, 1.178–4.588), larger tumor size (HR, 1.17; 95% CI, 1.02–1.3) and KRAS mutation (HR, 1.73; 95% CI, 1.03–2.8) were also significantly correlated with OS. The gene discussed is KRAS; the disease is neoplasm.